Hey!
For a frame structure, the self weight and floor loads (acting along gravity/global Y) which are defined in the dead and live load cases are defined again in the global directions(positive X, Y and Z directions) as dynamic masses for a time history load case. How will the dynamic masses be defined for an elevated water tank?
I have modelled an elevated intze tank where the container is modeled using plates. The loads defined are - selfweight and pressures (hydrostatic and hydrodynamic) which act on the wall and base of the container. These (trapezoidal) pressures act along the local z axis of the plates. So while defining the dynamic masses for the time history load case how should the pressures be defined?